Welding apparatus



Dec. 28, 1926.

H. BELMONT -WELDING APPARATUS Original Filed June 4, 1923 2 Sheets-Sheet 1 amvcuto'a H. BELMONT WELDING APPARATUS Dec. 28 1926. 1,611,875

Original Filed June 4, 1923 2 Sheets-Sheet 2 EE mill-11* 1Z9 a ike-c1101 Patented Dec. 28, 1926.

UNITED STATES 1,611,875 PATENT OFFICE.

HAERY BELMONT, OF CLEVELAND, OHIO, ASSIGNOR, B Y DIRECT AND MESNE ASSIGN- MENTS, TO THE ELYRIA IRON AND STEEL COMPANY, OF CLEVELAND, OHIO, A COR- PORATION OF OHIO.

WELDING APPARATUS.

Application filed June 4, 1923, Serial No. 643,172, Renewed September 15, 1926.

This invention relates to welding apparatus and more particularly to seam-weld ng and has to do rimarily with the smoothing out of the weld so as to obliterate any burrs that may have resulted from the welding operation.

It is the object of the invention to provide means for smoothing out the weld that W111 be adapted for use with the so-called continuous welding machines such as are commonly used for welding the longitudinal seam of tubing formed from strip metal.

A further object of the invention is to provide a device for the purpose specified that will be of'simple construction and capableof operating on the inside as well as on the outside of a tube or, in other words, on both sides of the weld, immediately after the welding operation and while the metal is still hot and com aratively soft.

Other objects an the features of novelty will be apparent from the following description taken in connection with the accompanying drawings in which:

Figure 1 illustrates, somewhat diagrammatically, a side elevation of a portion of an electric tube welding machine, embodying my invention;

Fig. 2is a transverse section on the line 2-2 of Fig. 1

Fig. 8 is a transverse 33 of Fig. 1;

Fig. 4 is a transverse section of a tube to indicate the condition of the seam immediately after the welding operation;

Fig. 5 is a plan view of a special mandrel forming part of my invention;

Fig. 6 is a longitudinal section of the same;

Fig. '7 is a plan view of a modified form of rod for holding the mandrel; and

Fig. 8 is a longitudinal section through a modified form of mandrel for tubes of relatively large size. I

Referring to the drawings, it maybe said that Fig. 1 illustrates a portion of amachine of the type shown and described in the Parpart Patent 658,741, the view being similar section on the line to that of Fi 4 ofsaid patent. While I have shown, or the-purpose of illustrating the princi les of my invention, a welding machine of the type illustrated in the Parpart patent, it will be understood that the invention may be applied to othentypes of.

welding machines wherein the welding is either performed by electricity or by oxyacetylene gas or any equivalent means.

F i 1, 10 indicates a portion of the frame 0 the machine 11 one of the contact rolls for supplying electricity to make the weld and 12 one of the pressure rolls for forcing the edges of the seam .into intimate contact. In the Parpart machine, above referred to, there are two of the rolls 11, on

opposite sides of the seam, and two of the rolls 12. The rolls 13 and 14 feed in the tube, to be welded, and the roll 15 acts as a uide roll. In place of. the two draft rolls of the Parpart patent, I emplo the three rolls 16, 17 and 18, the latter r0 1 being, in all respects, the equivalent of the upper roll J shown in the patent and being sitively driven by the shaft 18' which is riven by any suitable gearing such as is shown in the atent. The rolls 19 and 20 are similar in unction to the rolls M of the Parpart patent. The roll 18 is vertically adjustable to and from the tube by means of the screw 21, as'in the Parpart patent. The tube, in ,the drawings, is indicated at T and moves in the direction of the arrow. 1

The rolls 16 and 17 are rotatably mounted on spindles 22 which are supported in the U-shaped frame 23. The frame 23 is carried on studs 24: which are secured to a bracket 25 by means of the nuts 26. The

bracket 25 may be secured to the frame of thewelding machine or any suitable support by means of the bolts 27, and the studs '24: and nuts 26 provide for the adjustment of the frame 23, together with the rolls 1 and 17, to and from the tube T.

Arranged within the tube T is a mandrel 1 or carriage 28 which is secured to the end of a rod 29 and the latter is secured to a bracket 30 which projects through the open seam of the tube T' and is secured to the frame 10 of the machine by one or more bolts 31. The end of the rod 29, which engages thus cup smaller than the internal diameter o 28 may which is prefera 1y arran ed midway between the wheels 34, in a ot 38 and. rotatably supported on a pin 39. From Fig. 6 it will be observed that the wheels 34 project below the carriage 28 wliefeas the roller 37 projects above the carriage and is adapted-. to contact with the inner surface of the tube.

(see Fi 3). This arrangement brings the roller 3 in vertical ali ment with the roll 18 and the latter, w ich presses on the external surface of the tube, cooperateswith the roller 37 to roll down any burrs, such as shown at t' in Fig. 4, that my be on the inside or outside of the tube. rom Fig. 1 it will be seen that the pressure of the roll 18 will be transmitted through the roller 37 to the carriage 28 and from the latter througlt the wheels 34'and the portion of the tube 0 posite the welded seam, to the rolls 16 an 17. The rolls 16 and 17, bein rigidly supported, therefore enable the rol 18 and the roller 37 to exert the necessary ressure on the weld to roll down the burrs. he peripheries of the rollers 34 and 37 will be turned to conform to the interior of the tube. It should also be borne in mind that the welded portion of the tube will still be hot by the time it reaches the roll 18 and hence the metal will be soft enough to permit the rolling down of the burr without liability of injuring the-weld.

The rollingl of the weld, as above described, also as the advantage of working the metal while hot and thereby results in a weld of more homogeneous structure.

By using a'relatively large roller 37, that is, compared to the internal diameter of the tube, I have found that I am not troubled with the roller sticking from overheating or otherwise and the heat which is transmitted to the roller,from the hot weld with which it contacts seems to be. effectively dissipated and the device operates efficiently for long periods at a time. a

In Fi 7 there is illustrated a modification of t e rod 29 shown in Fig. 1, thei'nodification consisting in using an open link '29 in place of the solid rod through the welding zone. This link has a threaded c nnection atone end with the mandrel or carriage 28 and at the other end with the rod 29 which is connected to the bracket 30. The open link 29 permits the sparks which are formed in the weldinfioperation and thus build up'a mass which is liable to cause trouble u on becoming detached and being carried a ong by the tube and then jamming between the mandrel and tube which results in either stopping the tube or carlii'ying away the mandrel.

In ig. 8, I ave illustrated a formof mandrel suitable for use for large size tube, in which case the-rolls J, J of the Par art patent ma be emplo ed instead of the t ree rolls 16, 1 and 18 0 Fig. 1. In Fig. 8, the mandrel or carriage 28 carries two rollers 34, which are arranged in ali ment with the rolls J, J and have their a jacent sides in contact so that the pressure is transmitted directly from one roller to the other. I have found that this arrangement is suitable for use with large size tube because it is then possible to have the rollers 34' lar e enough in size to prevent sticking. If t e rollers 34 stick or, in other words are from rotating they drag on the inside of the tube and tend to scratch the inner surface of the tube and thus'weaken it and render it unsuited to some ur 5.

Having thus describe my invention, what I claim is:

1. In apparatus of the class described, the combination of means for heating the ed es of a seam to be welded, pressure means or forcing said ed es'together to produce a weld, and rolls aving relatively 'fixed axes arranged to o crate on opposite sides of the weld to smoot down the urrs produced in making the weld.

2. In apparatus of the class described, the combination of means for heating the longitudinal edges of a tube to be welded, means for forcing said edges together to produce a weld, a carriage arranged inside the tube and having rotatable supporting means engagin the surface of the tube 0 posiite the wel sup orting means for t e tube opposed to mi rotatable supporting means, a roller on said carriage for operating on the weld to's nooth down the interior burr, a roll on the exterior of the tube 0 posed to said roller and operating on t e weld to smooth down the exterior burr, and

means fonholding said carriage in the de-' sired osition.

3. n apparatus of the classdescribed, the combination of means for heatingthe longitudinal edges ofa tube to be welded, means for forcing said edges together to produce a weld, a carriage arran ed inside the tubeand havin sup ortin w eels that run on the interns sur ace 0 the tube, a roller on said carriage between said wheels for operating on the weld to smooth down prevented the interior burrs, rolls on the outside of the tube opposed to said wheels and roller, and means for holding said carriage in the desired position.

4. in tube Welding apparatus, the combination of means for heeting the longitudinel edges of the tube to be welded, means for forcing ssid edges together to produce it Weld thereby forming burrs on the surfaces of the tube, 5, carriage arranged. inside the tube and having supporting Wheels that run on the internal surface of the tuhe, a roller rotntehl mounted on said carriage and having e diameter slightly less than the bore ef the tube, and external rolls opposed to said Wheels and said roller, said roller and the roll opposel thereto operating on the Welded seem of tube to smooth out any external or internal burrs.

5. in tube Welding apparatus, means for heating the edges to he Welded, means for moving the tube in the direction of its axis, and :1 pair or"? rolling elements having relatively fixed axes one of said elements being inside the tube which extend transversely of the tube, and the other outside, said elements cooperating to squeeze the Welded seam between them as the tube moves in the direc tion of its axis and thereby smooth out any internal or external burrs on the tube.

6. In apparatus out the class described, the combination of menus for Welding the longitudinal seem of e tube, e mendrel Within the tube for smoothing" down any burrs formed in the Welding operation, e holder for said mandrel extending longitudinally of the tube to point in advance of-the Welding means, a bracket projecting through the seam of the tube and to which said holder is attached, and said holder heving a longitudinally extending opening therein in the region of said Welding means permitting the passage of sparks therethrough and thereby avoiding detrimental accumulations on said holder.

In testimony whereof I ar'iix my signature.

HARRY BELMONT. 

